Huawei quidway s7700 Configuration Manual page 692

Quidway S7700 Smart Routing Switch
Configuration Guide - VPN
By analyzing the reply packet in response to the detection request packet sent from a PE to a
specified VSI or MAC address on the VPLS network, VPLS MAC Ping and VPLS MAC Trace
can detect whether the MAC address learning capability of devices on the VPLS network is
normal, which helps to determine whether the Layer 2 forwarding function works well.
The forwarding of request packets relies on the MAC forwarding table. If the MAC address is
unknown, request packets are broadcast throughout the Pseudo Wire (PW) in the specified VSI
and received by multiple peers. For MAC Ping requests, only the device with the specified MAC
address returns a reply packet. For MAC Trace requests, each node on the network that the
request packet passes returns a reply packet.
S7700 supports the following VPLS network detection modes:
l
l
E-STP
l
Issue 01 (2011-07-15)
NOTE
For detailed principles of VPLS MAC Ping and VPLS MAC Trace, refer to the Chapter "VPLS" in the
Quidway S7700 Smart Routing Switch Feature Description.
Non-NQA mode: indicates that the network detection is implemented through a command
line. In this mode, information about the VPLS MAC Ping and VPLS MAC Trace is
immediately displayed after the command is run.
The non-NQA mode is applicable to following VPLS network types:
– Martini VPLS
– Kompella VPLS
– Martini H-VPLS
NQA mode: NQA VPLS MAC Ping and NQA VPLS MAC Trace
This mode supports the concurrent and scheduling of multiple NQA test instances, and the
display of statistics about packets.
A CE dual homed to the VPLS network
As shown in Figure 7-6, PEs are fully meshed in the VPLS network, and the CE is dual
homed to the VPLS network through two PEs. When the CE forwards broadcast packets
or unknown unicast packets, the process is as follows:
1. The CE sends broadcast packets or unknown unicast packets to PE2 or PE3.
2. After receiving the broadcast packets or unknown unicast packets, PE2 or PE3
broadcasts these packets.
3. After receiving the packets broadcast by PE2 or PE3, the other PE, that is, PE3 or PE2,
also broadcasts the packets. The packets, however, are from the PW side. Therefore,
PE3 or PE2 broadcasts these packets to the CE side.
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